Finger rest and plunger control for all-glass hypodermic syringes



' L. EISELE FINGER REST AND HJUNGER CONTROL FOR ALL GLASS HYPODERNIC SYRINGES Filed March 6, 192:5

main sill m INVENTOR. L OGHN 51351.:

ATTORNEYS Patented Feb. 10, 1925.

UNITED STATES LOGAN EISELE, OF NASHVILLE, TENNESSEE.

FINGER BEST AND PLUNGER CONTROL FOR ALL-GLASS HYPODERMIC SYRINGES.

- Application filed March 6, 1923.

To all whom it may concern:

Be it known that I, LOGAN EISELE, a citizen of the United States, residing at Nashville, county of Davidson, and State of Tennessee, have invented certain new and useful Improvements in Finger Rests and Plunger Controls for All-Glass Hypodermic Syringes, of which the following is a specification.

The principal object of this invention is toprovide a new and improved construction in a finger rest and plunger control for hypodermic syringes whereby the finger rest may be removed from the syringe and the plunger control is so constructed that it may be readily thrown back to an inoperative position out of engagement with the plunger to permit the removal of the finger rest without bending or otherwise injuring the control.

Another object is to so construct the plunger control that it will bear evenly against substantially a complete circumference.

A further object is to detachably mount the plunger control upon the finger rest in such a manner as to permit the convenient removal of the control from the finger rest without removing or otherwise disturbing the position of the finger rest.

For the accomplishment of these and such further objects as will hereinafter be apparent to those skilled in the art to which this appertains, the invention consists in the construction, combination and arrangement of parts herein specifically described and illustrated in the accompanying drawings, wherein is shown a preferred embodiment of the invention, but it is to be understood that changes, variations and modifications may he resorted to which fall within the scope of the claims hereunto appended.

In the drawings forming a portion of this specification:

Fig. 1 is a side elevation of a syringe embodying my invention.

Fig. 2 is a section on the line 22 of Fig. 1.

Fig. 3 is a section on the line 3-3 of Fig. 2.

Figs. 4, 5 and 6 are views similar to Fig. 2, each showing a different modification of the means for attaching the plunger control to the finger rest.

Referring to Figs. 1 to 3 of the drawing, the syringe proper consists of the usual barrel or cylinder 10 having the tip 11 integral Serial No. 623,138.

therewith, and in which the plunger or piston 12 is slidably mounted, these parts being constructed entirely of glass. The finger rest consists of a sleeve portion 13 of sheet metal having the finger grips 14: preferably integral with the sleeve portion and projecting laterally therefrom. The upper edge of the sleeve portion 18 is curved or bent outwardly as indicated at 15 to permit the sleeve to be readily engaged over the barrel 10 and the sleeve is slit or cut away as indicated at 16 to provide resiliency whereby the sleeve may not only yield when it is being placed over the barrel but will also grip the barrel in firm frictional engagement.

The plunger control consists of a length of spring wire bent to form a circular loop 17 proportioned to snugly engage the piston 12, the wire being crossed as indicated at 18 to complete the loop. The wire is then curved downwardly as indicated at 19 and is then bent sharply inwardly to provide the anchoring tongues 20 which act as pivots upon which the wire may be swung to the dotted line position shown in Fig. 1 when it is desired to remove the finger rest from the cylinder. It will be understood that when the plunger control is moved to the dotted line position that the plunger 12 must first be withdrawn from the barrel 10.

In the form shown in Figs. 1 to 3 the anchoring tongues 20 are merely brought under the finger grips 14, the resiliency of the wire causing the sharp bends adjacent the tongues 20 to grip the side edges of the finger grips 1% and hold the plunger control in position.

In the form shown in Fig. 1 a small hollow boss 21 is provided on the under face of the grips 14: and the tongues 20 are inserted into the hole of the boss. In Fig. 5 the boss 21 similar to the boss 21 is provided on the upper face of the grips 14 while in Fig. 6 the grips 14 are made of suflicient thickness to provide enough stock to allow for drilling the hole 22 to accommodate the tongues 20.

It will be obvious that with each of the forms shown that in order to detach the plunger control from the finger rest, it is only necessary to spring the wire sufficiently to allow the ends of the tongues 20 to clear the side edges of the grips, and that this may be done either while the loop is engaged with or disengaged from the piston 12.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A finger rest and plunger control for a hypodermic syringe, said finger rest having a sleeve portion to engage the cylinder of the syringe and a finger grip portion extending laterally from said sleeve, and said plunger control comprising a length of spring wire bent to form a loop portion proportioned to engage substantially the entire circumference of the syringe plunger with a yielding frictional pressure, and a pair of inwardly bent anchoring tongues to detachably engage said finger grip.

2. A finger rest and plunger control for a hypodermic syringe, said finger rest having a sleeve portion to engage the cylinder of the syringe and a finger grip portion extending laterally from said sleeve, and said plunger control comprising a length of sizing wire bent to form a loop portion proportioned to engage substantially the entire circumference of the syringe plunger with a yielding frictional pressure, a pair of inwardly bent anchoring tongues to detachably engage said finger grip, said spring wire being so bent as to permit said loop portion to be swung upon said anchoring tongues as a pivot to a position substantially parallel with and to one side of said plunger.

3. A finger rest and plunger control for a hypodermic syringe, said finger rest having a sleeve portion to engage the cylinder of the syringe and a finger grip portion eX- tending laterally from said sleeve, and said plunger control comprising a length of spring wire bent to form a loop portion proportioned to engage substantially the entire circumference of the syringe plunger with a yielding frictional pressure, and a pair of inwardly bent anchoring tongues, and said finger grip provided with means in which said anchoring tongues may be pivotally and detachably engaged.

4;. A finger rest and plunger control for a hypodermic syringe, said finger rest hav ing a sleeve portion to engage the cylinder of the syringe and a finger grip portion extending laterally from said sleeve, and said plunger control com 'nising' a length of spring wire bent to form a loop portion proportioned to engage substantially the entire circumference of the syringe plunger with a yielding frictional pressure and a pair of inwardly bent anchoring tongues, and said finger grip provided with means in which said anchoring tongues may be pivotally and detachably engaged, said means comprising an aperture extending transversely across said finger grip.

In testimony whereof I have affixed my signature.

LOGAN EISELEL, 

